Created by StemPy LabWhy do astronomers build telescopes with objectives of very large diameter?
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← A small refracting telescope is focused so that a relaxed eye can use it. Its objective lens has a focal length of 91 cm and its eyepiece has a focal length of 3.5 cm. By what factor does it enlarge the angle between two stars?Two stars lie very close together in the sky. A club observes them through a refracting telescope whose lens is 12 cm across, using a blue filter that passes light of wavelength 460 nm. What is the smallest angle between the stars for which they still look like two? →
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